{"id":2115,"date":"2020-06-16T13:58:08","date_gmt":"2020-06-16T11:58:08","guid":{"rendered":"https:\/\/koustrup.com\/?page_id=2115"},"modified":"2022-09-08T15:32:33","modified_gmt":"2022-09-08T13:32:33","slug":"lukkerhastighed-og-flash","status":"publish","type":"page","link":"https:\/\/foto-video.dk\/?page_id=2115","title":{"rendered":"7.3: Lukkerhastighed og flash"},"content":{"rendered":"<nav aria-label=\"breadcrumbs\">\n            <div class=\"breadcrumb-container theme1\">\n                <ol>\n                    <li><a title=\"Du er her\" href=\"#\"><span>Du er her<\/span><\/a><span class=\"separator\">&gt;&gt;<\/span><\/li>\n                    <\/ol>\n            <\/div>\n        <\/nav>    <script type=\"application\/ld+json\">\n        {\n            \"@context\": \"http:\/\/schema.org\",\n            \"@type\": \"BreadcrumbList\",\n            \"itemListElement\": [\n                 {\n                            \"@type\": \"ListItem\",\n                            \"position\": 1,\n                            \"item\": {\n                                \"@id\": \"#\",\n                                \"name\": \"Du er her\"\n                            }\n                        }\n                                                    ]\n        }\n    <\/script>\n   \n    <script>\n            <\/script>\n\n<hr \/>\n<div style=\"color: black;\">\n<table style=\"width: 100%; border: 0px; vertical-align: top; padding: 5px; margin-right: auto; margin-left: auto;\">\n<tbody>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px;\" colspan=\"2\">Flashen afgiver lys i et meget kort stykke tid (fx som grafen nedenfor). Som vi s\u00e5 under flash og omgivende lys (<a href=\"https:\/\/foto-video.dk\/?page_id=2112\">se her<\/a>) vil det lys, der eksponerer billedet, v\u00e6re summen af det omgivende lys og flashens lys.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px;\" colspan=\"2\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/FlashSekvens1.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-2194\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/FlashSekvens1.png\" alt=\"\" width=\"664\" height=\"200\" \/><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px;\" colspan=\"2\">N\u00e5r flashpulsens l\u00e6ngde (det gr\u00e5 omr\u00e5de) er mindre end den tid lukkeren er \u00e5ben (her 1\/500 sekund), har lukkerhastigheden ingen indflydelse p\u00e5, hvor meget flashlys der kommer frem til sensoren og dermed eksponeringen af billedet. Kun sensorens ISO f\u00f8lsomhed og bl\u00e6nden vil have indflydelse p\u00e5 eksponeringen.<\/p>\n<p>Lukkerhastighed, bl\u00e6nde og ISO vil stadig have indflydelse p\u00e5 eksponeringen af billedet med hensyn til det omgivende lys.<\/p>\n<p>Nedenst\u00e5ende billeder illustrerer, at lukkerhastigheden ingen indflydelse har p\u00e5 eksponeringen. Det omgivende lys er filtreret fra, ved at g\u00e5 ned i ISO (stoppe ned) og g\u00e5 op i bl\u00e6nde (stoppe ned), indtil billedet er sort ved det omgivende lys alene.<\/p>\n<p>Flashen er sat p\u00e5 fuld styrke, hvilket med min studieflash betyder, at flashpulsens l\u00e6ngde er ca. 1\/200 sekund. Endvidere er der nogle f\u00e5 millisekunders forsinkelse fra lukkeren er \u00e5ben til flashen fyres af. Kameraet kan synkronisere flashen ved en lukkerhastighed op til 1\/250 sekund (1\/320 sekund).<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px; width: 60%;\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01820-1024x683-1.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-2198\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01820-1024x683-1.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><\/a><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 5px;\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>Lukkerhastighed:<\/strong> 1\/15 sekund<\/li>\n<li><strong>Bl\u00e6nde:\u00a0<\/strong><em><strong>f<\/strong><\/em>8<\/li>\n<li><strong>ISO:<\/strong> 64<\/li>\n<li><strong>Br\u00e6ndvidde:<\/strong> 45mm<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px; width: 60%;\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01821-1024x683-1.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-2199\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01821-1024x683-1.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><\/a><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 5px;\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>Lukkerhastighed:<\/strong> 1\/30 sekund<\/li>\n<li><strong>Bl\u00e6nde:\u00a0<\/strong><em><strong>f<\/strong><\/em>8<\/li>\n<li><strong>ISO:<\/strong> 64<\/li>\n<li><strong>Br\u00e6ndvidde:<\/strong> 45mm<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px; width: 60%;\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01822-1024x683-1.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-2200\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01822-1024x683-1.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><\/a><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 5px;\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>Lukkerhastighed:<\/strong> 1\/60 sekund<\/li>\n<li><strong>Bl\u00e6nde:\u00a0<\/strong><em><strong>f<\/strong><\/em>8<\/li>\n<li><strong>ISO:<\/strong> 64<\/li>\n<li><strong>Br\u00e6ndvidde:<\/strong> 45mm<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px; width: 60%;\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01823-1024x683-1.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-2202\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01823-1024x683-1.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><\/a><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 5px;\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>Lukkerhastighed:<\/strong> 1\/125 sekund<\/li>\n<li><strong>Bl\u00e6nde:\u00a0<\/strong><em><strong>f<\/strong><\/em>8<\/li>\n<li><strong>ISO:<\/strong> 64<\/li>\n<li><strong>Br\u00e6ndvidde:<\/strong> 45mm<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px; width: 60%;\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01824-1024x683-1.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-2204\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01824-1024x683-1.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><\/a><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 5px;\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>Lukkerhastighed:<\/strong> 1\/160 sekund<\/li>\n<li><strong>Bl\u00e6nde:\u00a0<\/strong><em><strong>f<\/strong><\/em>8<\/li>\n<li><strong>ISO:<\/strong> 64<\/li>\n<li><strong>Br\u00e6ndvidde:<\/strong> 45mm<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px; width: 60%;\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01825-1024x683-1.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-2207\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01825-1024x683-1.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><\/a><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 5px;\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>Lukkerhastighed:<\/strong> 1\/200 sekund<\/li>\n<li><strong>Bl\u00e6nde:\u00a0<\/strong><em><strong>f<\/strong><\/em>8<\/li>\n<li><strong>ISO:<\/strong> 64<\/li>\n<li><strong>Br\u00e6ndvidde:<\/strong> 45mm<\/li>\n<\/ul>\n<p>Billedet er blevet lidt m\u00f8rkere, fordi der er en lille forsinkelse fra lukkeren \u00e5bner til flashen fyres af. Derfor &#8216;mangler&#8217; der en lille del af lyset fra flashpulsen og billedet bliver lidt m\u00f8rkere (undereksponeret)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px; width: 60%;\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01826-1024x683-1.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-2209\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01826-1024x683-1.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><\/a><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 5px;\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>Lukkerhastighed:<\/strong> 1\/250 sekund<\/li>\n<li><strong>Bl\u00e6nde:\u00a0<\/strong><em><strong>f<\/strong><\/em>8<\/li>\n<li><strong>ISO:<\/strong> 64<\/li>\n<li><strong>Br\u00e6ndvidde:<\/strong> 45mm<\/li>\n<\/ul>\n<p>P\u00e5 grund af forsinkelsen mellem lukkeren \u00e5bner og flashen fyres af, er lukkeren her begyndt at lukke igen, f\u00f8r flashen er fyret af (f\u00f8r flashpuls starter i diagrammet). Man f\u00e5r derfor den lille sorte stribe forneden. Samtidigt er der mindre lys til r\u00e5dighed og billedet bliver undereksponeret.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 2px; width: 60%;\"><a href=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01827-1024x683-1.jpg\"><img decoding=\"async\" class=\"alignleft wp-image-2211\" src=\"https:\/\/foto-video.dk\/wp-content\/uploads\/2022\/09\/2020_D810_01827-1024x683-1.jpg\" alt=\"\" width=\"450\" height=\"300\" \/><\/a><\/td>\n<td style=\"text-align: left; vertical-align: top; border: 0px; padding: 5px;\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>Lukkerhastighed:<\/strong> 1\/320 sekund<\/li>\n<li><strong>Bl\u00e6nde:\u00a0<\/strong><em><strong>f<\/strong><\/em>8<\/li>\n<li><strong>ISO:<\/strong> 64<\/li>\n<li><strong>Br\u00e6ndvidde:<\/strong> 45mm<\/li>\n<\/ul>\n<p>Kameraet vil have lukkeren fuldt \u00e5ben op til 1\/320 sekund og kan derfor (teoretisk) synkronisere p\u00e5 den hastighed. Imidlertid er der en forsinkelse fra lukkeren \u00e5bner og til flashen fyres af (Det tr\u00e5dl\u00f8se system plus selve flashen) p\u00e5 nogle f\u00e5 millisekunder. Derfor vil den sorte stribe forneden i billedet blive mere udtalt ved denne lukkerhastighed. Samtidigt vil kameraet ikke &#8216;f\u00e5 gl\u00e6de&#8217; af hele flashpulsen og billedet bliver st\u00e6rkt underbelyst.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Flashen afgiver lys i et meget kort stykke tid (fx som grafen nedenfor). Som vi s\u00e5 under flash og omgivende lys (se her) vil det lys, der eksponerer billedet, v\u00e6re summen af det omgivende lys og flashens lys. N\u00e5r flashpulsens l\u00e6ngde (det gr\u00e5 omr\u00e5de) er mindre end den tid lukkeren er \u00e5ben (her 1\/500 sekund), [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":164,"menu_order":30,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2115","page","type-page","status-publish","hentry","post"],"_links":{"self":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/2115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/foto-video.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2115"}],"version-history":[{"count":10,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/2115\/revisions"}],"predecessor-version":[{"id":2982,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/2115\/revisions\/2982"}],"up":[{"embeddable":true,"href":"https:\/\/foto-video.dk\/index.php?rest_route=\/wp\/v2\/pages\/164"}],"wp:attachment":[{"href":"https:\/\/foto-video.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}